We visited this site in 1996 when travelling by with a rented car we noticed these big ruined walls. We were quite surprised by such kind of architecture in West Africa and tried to ask local people what it was. For some it was an old warehouse for slaves for others an old warehouse for different kind of trades. If you are travelling in this fascinating area of Burkina Faso a stop is worth if you are interested in african story and architecture or if you are a WHS collector. Obviously at that time there was no ticket and no warden.